Well... I think I solved a very similar problem. Don't know if it's the same than yours, but It may help.1) My problem had the same aspect as yours: press brake with pedals, when the plane has stopped, try to move it again and the brakes were still applied. Then parking brakes on and then off and the plane moves again.2) I disconnected my T-Rudder pedals and repeated the man only with keyboard: No problem3) Checked my T-Rudder pedals with"Game devices" in Windows and Surprise!: The center point of the pedals was in the middle... thats the problem. It must be in the lower right corner.
4) I Recalibrated the pedals: Problem gone.
Not sure if it's your case.
Good Luck